Camera optical lens

ABSTRACT

The present disclosure discloses a camera optical lens, which includes, from an object-side to an-image side: a first lens having a positive refractive power, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eight lens, which satisfies following conditions: 0.95≤f/TTL; −4.00≤f2/f≤−2.00; and −20.00≤(R5+R6)/(R5−R6)≤−3.00; where TTL denotes a total optical length from an object-side surface of the first lens to an image surface of the camera optical lens along an optic axis; f denotes a focal length of the camera optical lens; f2 denotes a focal length of the second lens; R5 denotes a curvature radius of an object-side surface of the third lens; and R6 denotes a curvature radius of an image-side surface of the third lens. The camera optical lens can achieve good optical performance while meeting the design requirement for large aperture, long focal length and ultra-thinness.

TECHNICAL FIELD

The present disclosure relates to the field of optical lens, in particular to a camera optical lens suitable for handheld devices, such as smart phones and digital cameras, and imaging devices, such as monitors or PC lenses.

BACKGROUND

With the emergence of smart phones in recent years, the demand for miniature camera lens is increasing day by day, but in general the photosensitive devices of camera lens are nothing more than Charge Coupled Device (CCD) or Complementary Metal-Oxide Semiconductor Sensor (CMOS sensor), and as the progress of the semiconductor manufacturing technology makes the pixel size of the photosensitive devices become smaller, plus the current development trend of electronic products towards better functions and thinner and smaller dimensions, miniature camera lens with good imaging quality therefore have become a mainstream in the market.

In order to obtain better imaging quality, the lens that is traditionally equipped in mobile phone cameras adopts a three-piece, four-piece, or even five-piece or six-piece lens structure. However, with the development of technology and the increase of the diverse demands of users, and as the pixel area of photosensitive devices is becoming smaller and smaller and the requirement of the camera optical lens on the imaging quality is improving constantly, the eight-piece lens structure gradually appears in lens designs. Although the typical eight-piece lens already has good optical performance, its optical power, lens spacing and lens shape remain unreasonable to some extents, resulting in that the lens structure, which, even though, has excellent optical performance, is not able to meet the design requirement for large aperture, long focal length and ultra-thinness.

SUMMARY

A camera optical lens is provided, which includes, from an object side to an image side in sequence: a first lens having a positive refractive power, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eight lens; wherein the camera optical lens satisfies following conditions: 0.95≤f/TTL; −4.00≤f2/f≤−2.00; and −20.00≤(R5+R6)/(R5−R6)≤−3.00; where TTL denotes a total optical length from an object-side surface of the first lens to an image surface of the camera optical lens along an optical axis; f denotes a focal length of the camera optical lens; f2 denotes a focal length of the second lens; R5 denotes a central curvature radius of an object-side surface of the third lens; and R6 denotes a central curvature radius of an image-side surface of the third lens.

As an improvement, the camera optical lens further satisfies the following condition: −1.50≤f4/f≤−0.85; where f4 denotes a focal length of the fourth lens.

As an improvement, the camera optical lens further satisfies following conditions: 0.28≤f1/f≤1.12; −2.62≤(R1+R2)/(R1−R2)≤−0.41; and 0.06≤d1/TTL≤0.18; where f1 denotes a focal length of the first lens; R1 denotes a central curvature radius of the object-side surface of the first lens; R2 denotes a central curvature radius of an image-side surface of the first lens; and d1 denotes an on-axis thickness of the first lens.

As an improvement, the camera optical lens further satisfies following conditions: −1.83≤(R3+R4)/(R3−R4)≤0.21; and 0.01≤d3/TTL≤0.04; where R3 denotes a central curvature radius of an object-side surface of the second lens; R4 denotes a central curvature radius of an image-side surface of the second lens; and d3 denotes an on-axis thickness of the second lens.

As an improvement, the camera optical lens further satisfies following conditions: 0.83≤f3/f≤26.16; and 0.04≤d5/TTL≤0.13; where f3 denotes a focal length of the third lens; and d5 denotes an on-axis thickness of the third lens.

As an improvement, wherein the camera optical lens further satisfies following conditions: 0.68≤(R7+R8)/(R7−R8)≤3.78; and 0.02≤d7/TTL≤0.06; where R7 denotes a central curvature radius of an object-side surface of the fourth lens; R8 denotes a central curvature radius of an image-side surface of the fourth lens; and d7 denotes an on-axis thickness of the fourth lens.

As an improvement, the camera optical lens further satisfies following conditions: 0.86≤f5/f≤3.20; −0.28≤(R9+R10)/(R9−R10)≤0.29; and 0.04≤d9/TTL≤0.12; where f5 denotes a focal length of the fifth lens; R9 denotes a central curvature radius of an object-side surface of the fifth lens; R10 denotes a central curvature radius of an image-side surface of the fifth lens; and d9 denotes an on-axis thickness of the fifth lens.

As an improvement, the camera optical lens further satisfies following conditions: −23.24≤f6/f≤33.09; −23.59≤(R11+R12)/(R11−R12)≤65.50; and 0.03≤d11/TTL≤0.11; where f6 denotes a focal length of the sixth lens; R11 denotes a central curvature radius of an object-side surface of the sixth lens; R12 denotes a central curvature radius of an image-side surface of the sixth lens; and d11 denotes an on-axis thickness of the sixth lens.

As an improvement, the camera optical lens further satisfies following conditions: −11.55≤f7/f≤47.14; −14.31≤(R13+R14)/(R13−R14)≤204.30; and 0.03≤d13/TTL≤0.08; where f7 denotes a focal length of the seventh lens; R13 denotes a central curvature radius of an object-side surface of the seventh lens; R14 denotes a central curvature radius of an image-side surface of the seventh lens; and d13 denotes an on-axis thickness of the seventh lens.

As an improvement, the camera optical lens further satisfies following conditions: −2.20≤f8/f≤−0.51; 0.21≤(R15+R16)/(R15−R16)≤1.16; and 0.03≤d15/TTL≤0.10; where f8 denotes a focal length of the eighth lens; R15 denotes a central curvature radius of an object-side surface of the eighth lens; R16 denotes a central curvature radius of an image-side surface of the eighth lens; and d15 denotes an on-axis thickness of the eighth lens.

BRIEF DESCRIPTION OF DRAWINGS

To illustrate the technical solutions according to the embodiments of the present disclosure or in the prior art more clearly, the accompanying drawings for describing the embodiments or the prior art are introduced briefly in the following. Apparently, the accompanying drawings in the following description are only some embodiments of the present disclosure, and persons of ordinary skill in the art can derive other drawings from the accompanying drawings without creative efforts.

FIG. 1 is a schematic diagram of a structure of a camera optical lens according to Embodiment 1 of the present disclosure.

FIG. 2 is a schematic diagram of a longitudinal aberration of the camera optical lens shown in FIG. 1.

FIG. 3 is a schematic diagram of a lateral color of the camera optical lens shown in FIG. 1.

FIG. 4 is a schematic diagram of a field curvature and a distortion of the camera optical lens shown in FIG. 1.

FIG. 5 is a schematic diagram of a structure of a camera optical lens according to Embodiment 2 of the present disclosure.

FIG. 6 is a schematic diagram of a longitudinal aberration of the camera optical lens shown in FIG. 5.

FIG. 7 is a schematic diagram of a lateral color of the camera optical lens shown in FIG. 5.

FIG. 8 is a schematic diagram of a field curvature and a distortion of the camera optical lens shown in FIG. 5.

FIG. 9 is a schematic diagram of a structure of a camera optical lens according to Embodiment 3 of the present disclosure.

FIG. 10 is a schematic diagram of a longitudinal aberration of the camera optical lens shown in FIG. 9.

FIG. 11 is a schematic diagram of a lateral color of the camera optical lens shown in FIG. 9.

FIG. 12 is a schematic diagram of a field curvature and a distortion of the camera optical lens shown in FIG. 9.

DETAILED DESCRIPTION OF EMBODIMENTS

To make the objects, technical solutions, and advantages of the present disclosure clearer, embodiments of the present disclosure are described in detail with reference to accompanying drawings in the following. A person of ordinary skill in the art can understand that, in the embodiments of the present disclosure, many technical details are provided to make readers better understand the present disclosure. However, even without these technical details and any changes and modifications based on the following embodiments, technical solutions required to be protected by the present disclosure can be implemented.

Embodiment 1

Referring to the accompanying drawing, the present disclosure provides a camera optical lens 10. FIG. 1 shows a schematic diagram of a structure of a camera optical lens 10 provided in Embodiment 1 of the present disclosure, and the camera optical lens 10 includes eight lenses. Specifically, the camera optical lens 10 includes, from an object side to an image side in sequence: an aperture S1, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7 and an eighth lens L8. An optical element such as an optical filter GF can be arranged between the eighth lens L8 and an image surface Si.

In this embodiment, the first lens L1 has a positive refractive power, the second lens L2 has a negative refractive power, the third lens L3 has a positive refractive power, the fourth lens L4 has a negative refractive power, the fifth lens L5 has a positive refractive power, the sixth lens L6 has a positive refractive power, the seventh lens L7 has a positive refractive power and the eighth lens L8 has a negative refractive power. In this embodiment, the first lens L1 has a positive refractive power, which facilitates improvement of optical performance of the camera optical lens. It should be understood that in other embodiments, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7 and the eighth lens L8 may have other refractive power.

In this embodiment, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7 and the eighth lens L8 are made of plastic material. In other embodiments, the lenses may be made of other material.

In this embodiment, a total optical length from an object-side surface of the first lens L1 to an image surface Si of the camera optical lens 10 along an optical axis is defined as TTL, and a focal length of the camera optical lens 10 is defined as f, a focal length of the second lens L2 is defined as f2, a central curvature radius of an object-side surface of the third lens L3 is defined as R5, and a central curvature radius of an image-side surface of the third lens L3 is defined as R6. The camera optical lens 10 satisfies following conditions:

0.95≤f/TTL;  (1)

−4.00≤f2/f≤−2.00;  (2)

−20.00≤(R5+R6)/(R5−R6)≤−3.00.  (3)

Condition (1) specifies a ratio of the focal length f of the camera optical lens 10 and the total optical length TTL from the object-side surface of the first lens L1 to the image surface Si of the camera optical lens 10 along the optical axis. When the condition (1) is satisfied, given the same optical length, the camera optical lens 10 has a longer focal length.

Condition (2) specifies a ratio of the focal length f2 of the second lens L2 and the focal length f of the camera optical lens 10, which can effectively balance a spherical aberration and a field curvature of the camera optical lens.

Condition (3) specifies a shape of the third lens L3. Within this range, a deflection degree of lights passing through the lens can be alleviated, and the aberration can be effectively reduced.

A focal length of the fourth lens L4 is defined as f4. The camera optical lens 10 satisfies the following condition: −1.50≤f4/f≤−0.85, which specifies a ratio of the focal length f4 of the fourth lens L4 and the focal length f of the camera optical lens 10. With reasonable distribution of the refractive power, the camera optical lens has better imaging quality and lower sensitivity. Preferably, the camera optical lens 10 further satisfies the following condition: −1.46≤f4/f≤−0.88.

In this embodiment, the first lens L1 includes an object-side surface being convex in a paraxial region and an image-side surface being concave in the paraxial region.

The focal length of the camera optical lens 10 is defined as f, and a focal length of the first lens L1 is defined as f1. The camera optical lens 10 satisfies the following condition: 0.28≤f1/f≤1.12, which specifies a ratio of the focal length f1 of the first lens L1 to the focal length f of the camera optical lens 10. Within this range, the first lens L1 has an appropriate positive refractive power, which is beneficial for reducing the aberration of the camera optical lens and a development of the lenses towards ultra-thinness. Preferably, the camera optical lens 10 satisfies the following condition: 0.44≤f1/f≤0.90.

A central curvature radius of the object-side surface of the first lens L1 is defined as R1, and a central curvature radius of an image-side surface of the first lens L1 is defined as R2. The camera optical lens 10 satisfies the following condition: −2.62≤(R1+R2)/(R1−R2)≤−0.41. This can reasonably control a shape of the first lens L1 in such a manner that the first lens L1 can effectively correct the spherical aberration of the camera optical lens. Preferably, the camera optical lens 10 satisfies the following condition: −1.64≤(R1+R2)/(R1−R2)≤−0.51.

An on-axis thickness of the first lens L1 is defined as d1, and the total optical length from the object-side surface of the first lens L1 to the image surface Si of the camera optical lens 10 along the optical axis is defined as TTL. The camera optical lens 10 satisfies the following condition: 0.06≤d1/TTL≤0.18. Within this range, it is beneficial for realization of ultra-thin lenses. This can facilitate achieving ultra-thinness of the lenses. Preferably, the camera optical lens 10 satisfies the following condition: 0.10≤d1/TTL≤0.15.

In this embodiment, the second lens L2 includes an object-side surface being concave in the paraxial region and an image-side surface being concave in the paraxial region.

A central curvature radius of an object-side surface of the second lens L2 is defined as R3, and a central curvature radius of an image-side surface of the second lens L2 is defined as R4. The camera optical lens 10 satisfies the following condition: −1.83≤(R3+R4)/(R3−R4)≤0.21, which specifies a shape of the second lens L2. Within this range, a development of the lenses towards ultra-thinness would facilitate correcting an on-axis chromatic aberration. Preferably, the camera optical lens 10 satisfies the following condition: −1.14≤(R3+R4)/(R3−R4)≤0.17.

An on-axis thickness of the second lens L2 is defined as d3, and the total optical length from the object-side surface of the first lens L1 to the image surface Si of the camera optical lens 10 along the optical axis is defined as TTL. The camera optical lens 10 satisfies the following condition: 0.01≤d3/TTL≤0.04. Within this range, it is beneficial for realization of ultra-thin lenses. Preferably, the camera optical lens 10 satisfies the following condition: 0.02≤d3/TTL≤0.04.

In this embodiment, the third lens L3 includes an object-side surface being convex in the paraxial region and an image-side surface being concave in the paraxial region.

The focal length of the camera optical lens 10 is defined as f, and a focal length of the third lens L3 is defined as f3. The camera optical lens 10 satisfies the following condition: 0.83≤f3/f≤26.16. With reasonable distribution of the refractive power, the camera optical lens has better imaging quality and lower sensitivity. Preferably, the camera optical lens 10 satisfies the following condition: 1.32≤f3/f≤20.93.

The on-axis thickness of the third lens L3 is defined as d5, and the total optical length from the object-side surface of the first lens L1 to the image surface Si of the camera optical lens 10 along the optical axis is defined as TTL. The camera optical lens 10 satisfies the following condition: 0.04≤d5/TTL≤0.13. Within this range, it is beneficial for realization of ultra-thin lenses. Preferably, the camera optical lens 10 satisfies the following condition: 0.06≤d5/TTL≤0.10.

In this embodiment, the fourth lens L4 includes an object-side surface being convex in the paraxial region and an image-side surface being concave in the paraxial region.

A central curvature radius of the object-side surface of the fourth lens L4 is defined as R7, and a central curvature radius of an image-side surface of the fourth lens L4 is defined as R8. The camera optical lens 10 satisfies the following condition: 0.68≤(R7+R8)/(R7−R8)≤3.78, which specifies a shape of the fourth lens L4. Within this range, the development of the lenses towards ultra-thinness would facilitate correcting an off-axis aberration. Preferably, the camera optical lens 10 satisfies the following condition: 1.08≤(R7+R8)/(R7−R8)≤3.02.

An on-axis thickness of the fourth lens L4 is defined as d7, and the total optical length from the object-side surface of the first lens L1 to the image surface Si of the camera optical lens 10 along the optical axis is defined as TTL. The camera optical lens 10 satisfies the following condition: 0.02≤d7/TTL≤0.06. Within this range, it is beneficial for realization of ultra-thin lenses. Preferably, the camera optical lens 10 satisfies the following condition: 0.03≤d7/TTL≤0.05.

In this embodiment, the fifth lens L5 includes an object-side surface being convex in the paraxial region and an image-side surface being convex in the paraxial region.

The focal length of the camera optical lens 10 is defined as f, and a focal length of the fifth lens L5 is defined as f5. The camera optical lens 10 satisfies the following condition: 0.86≤f5/f≤3.20, which can effectively make a light angle of the camera lens gentle and reduce tolerance sensitivity. Preferably, the camera optical lens 10 satisfies the following condition: 1.37≤f5/f≤2.56.

A central curvature radius of an object-side surface of the fifth lens L5 is defined as R9, and a central curvature radius of an image-side surface of the fifth lens L5 is defined as R10. The camera optical lens 10 satisfies the following condition: −0.28≤(R9+R10)/(R9−R10)≤0.29, which specifies a shape of the fifth lens L5. Within this range, the development of the lenses towards ultra-thinness would facilitate correcting the off-axis aberration. Preferably, the camera optical lens 10 satisfies the following condition: −0.17≤(R9+R10)/(R9−R10)≤0.23.

An on-axis thickness of the fifth lens L5 is defined as d9, and the total optical length from the object-side surface of the first lens L1 to the image surface Si of the camera optical lens 10 along the optical axis is defined as TTL. The camera optical lens 10 satisfies the following condition: 0.04≤d9/TTL≤0.12. Within this range, it is beneficial for realization of ultra-thin lenses. Preferably, the camera optical lens 10 satisfies the following condition: 0.06≤d9/TTL≤0.10.

In this embodiment, the sixth lens L6 includes an object-side surface being concave in the paraxial region and an image-side surface being convex in the paraxial region.

The focal length of the camera optical lens 10 is defined as f, and a focal length of the sixth lens L6 is defined as f6. The camera optical lens 10 satisfies the following condition: −23.24≤f6/f≤33.09. With reasonable distribution of the refractive power, the camera optical lens has better imaging quality and lower sensitivity. Preferably, the camera optical lens 10 satisfies the following condition: −14.52≤f6/f≤26.47.

A central curvature radius of an object-side surface of the sixth lens L6 is defined as R11, and a central curvature radius of an image-side surface of the sixth lens L6 is defined as R12. The camera optical lens 10 satisfies the following condition: −23.59≤(R11+R12)/(R11−R12)≤65.50, which specifies a shape of the sixth lens L6. Within this range, the development of the lenses towards ultra-thinness would facilitate correcting the off-axis aberration. Preferably, the camera optical lens 10 satisfies the following condition: −14.74≤(R11+R12)/(R11−R12)≤52.40.

An on-axis thickness of the sixth lens L6 is defined as d11, and the total optical length from the object-side surface of the first lens L1 to the image surface Si of the camera optical lens 10 along the optical axis is defined as TTL. The camera optical lens 10 satisfies the following condition: 0.03≤d11/TTL≤0.11. Within this range, it is beneficial for realization of ultra-thin lenses. Preferably, the camera optical lens 10 satisfies the following condition: 0.04≤d11/TTL≤0.09.

In this embodiment, the seventh lens L7 includes an object-side surface being concave in the paraxial region and an image-side surface being convex in the paraxial region.

The focal length of the camera optical lens 10 is defined as f, and a focal length of the seventh lens L7 is defined as f7. The camera optical lens 10 satisfies the following condition: −11.55≤f7/f≤47.14. With reasonable distribution of the refractive power, the camera optical lens has better imaging quality and lower sensitivity. Preferably, the camera optical lens 10 satisfies the following condition: −7.22≤f7/f≤37.71.

A central curvature radius of an object-side surface of the seventh lens L7 is defined as R13, and a central curvature radius of an image-side surface of the seventh lens L7 is defined as R14. The camera optical lens 10 satisfies the following condition: −14.31≤(R13+R14)/(R13−R14)≤204.30, which specifies a shape of the seventh lens L7. Within this range, the development of the lenses towards ultra-thinness would facilitate correcting the off-axis aberration. Preferably, the camera optical lens 10 satisfies the following condition: −8.94≤(R13+R14)/(R13−R14)≤163.44.

An on-axis thickness of the seventh lens L7 is defined as d13, and the total optical length from the object-side surface of the first lens L1 to the image surface Si of the camera optical lens 10 along the optical axis is defined as TTL. The camera optical lens 10 satisfies the following condition: 0.03≤d13/TTL≤0.08. Within this range, it is beneficial for realization of ultra-thin lenses. Preferably, the camera optical lens 10 satisfies the following condition: 0.04≤d13/TTL≤0.07.

In this embodiment, the eighth lens L8 includes an object-side surface being concave in the paraxial region and an image-side surface being concave in the paraxial region.

The focal length of the camera optical lens 10 is defined as f, and a focal length of the eighth lens L8 is defined as f8. The camera optical lens 10 satisfies the following condition: −2.20≤f8/f≤−0.51. With reasonable distribution of the refractive power, the camera optical lens has better imaging quality and lower sensitivity. Preferably, the camera optical lens 10 satisfies the following condition: −1.38≤f8/f≤−0.64.

A central curvature radius of an object-side surface of the eighth lens L8 is defined as R15, and a central curvature radius of an image-side surface of the eighth lens L8 is defined as R16. The camera optical lens 10 satisfies the following condition: 0.21≤(R15+R16)/(R15−R16)≤1.16, which specifies a shape of the eighth lens L8. Within this range, the development of the lenses towards ultra-thinness would facilitate correcting the off-axis aberration. Preferably, the camera optical lens 10 satisfies the following condition: 0.34≤(R15+R16)/(R15−R16)≤0.93.

An on-axis thickness of the eighth lens L8 is defined as d15, and the total optical length from the object-side surface of the first lens L1 to the image surface Si of the camera optical lens 10 along the optical axis is defined as TTL. The camera optical lens 10 satisfies the following condition: 0.03≤d15/TTL≤0.10. Within this range, it is beneficial for realization of ultra-thin lenses. Preferably, the camera optical lens 10 satisfies the following condition: 0.05≤d15/TTL≤0.08.

It should be appreciated that, in other embodiments, configuration of object-side surfaces and image-side surfaces of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7 and the eighth lens L8 may have a distribution in convex and concave other than that of the above-described embodiment.

In this embodiment, an image height of the camera optical lens 10 is defined as IH, and the focal length of the camera optical lens 10 is defined as f. The camera optical lens 10 satisfies the following condition: f/IH≥2.56, which makes the camera optical lens have a long focal length.

In an embodiment, an F number of the camera optical lens 10 is defined as FNO. The camera optical lens 10 satisfies the following condition: FNO≤2.01, which makes the camera optical lens have a large aperture.

In this embodiment, the image height of the camera optical lens 10 is defined as IH, and the total optical length from the object-side surface of the first lens L1 to the image surface Si of the camera optical lens 10 along the optical axis is defined as TTL. The camera optical lens 10 satisfies the following condition: TTL/IH≤2.68, which is beneficial for realization of ultra-thin lenses.

The focal length of the camera optical lens 10 is defined as f, and a combined focal length of the first lens L1 and the second lens L2 is defined as f12. The camera optical lens 10 satisfies the following condition: 0.34≤f12/f≤1.34. Within this range, the aberration and distortion of the camera optical lens 10 can be eliminated and a back focal length of the camera optical lens 10 can be reduced, so that miniaturization of the camera optical lens can be maintained. Preferably, the camera optical lens 10 satisfies the following condition: 0.54≤f12/f≤1.07.

When the above conditions are satisfied, the camera optical lens 10 meets the design requirement for large aperture, long focal length and ultra-thinness while having excellent optical imaging performance. Based on the characteristics of the camera optical lens 10, the camera optical lens 10 is particularly applicable to mobile camera lens assemblies and WEB camera lenses composed of such camera elements as CCD and CMOS for high pixels.

The camera optical lens 10 will be further described with reference to the following examples. Symbols used in various examples are shown as follows. The focal length, on-axis distance, central curvature radius, on-axis thickness, inflexion point position, and arrest point position are all in units of mm.

TTL: Total optical length (the distance from the object side surface of the first lens L1 to the image surface Si of the camera optical lens along the optical axis) in mm.

FNO: Ratio of an effective focal length and an entrance pupil diameter of the camera optical lens.

Preferably, inflexion points and/or arrest points can be arranged on the object-side surface and/or the image-side surface of each lens, so as to satisfy the demand for high quality imaging. The description below can be referred for specific implementations.

The design data of the camera optical lens 10 in Embodiment 1 of the present disclosure are shown in Table 1 and Table 2.

TABLE 1 R d nd vd S1 ∞ d0= −0.776 R1 3.242 d1= 1.119 nd1 1.5444 v1 55.82 R2 24.254 d2= 0.086 R3 −53.989 d3= 0.270 nd2 1.6400 v2 23.54 R4 40.589 d4= 0.070 R5 4.282 d5= 0.702 nd3 1.5444 v3 55.82 R6 8.544 d6= 0.133 R7 30.122 d7= 0.350 nd4 1.6610 v4 20.53 R8 4.552 d8= 0.624 R9 25.771 d9= 0.750 nd5 1.6400 v5 23.54 R10 −23.520 d10= 0.853 R11 −9.724 d11= 0.708 nd6 1.6610 v6 20.53 R12 −8.983 d12= 0.481 R13 −9.419 d13= 0.505 nd7 1.5444 v7 55.82 R14 −5.691 d14= 0.230 R15 −27.94 d15= 0.636 nd8 1.5444 v8 55.82 R16 4.392 d16= 0.779 R17 ∞ d17= 0.210 ndg 1.5168 vg 64.17 R18 ∞ d18= 0.849

In the table, meanings of various symbols will be described as follows.

S1: aperture;

R: a central curvature radius of an optical surface;

R1: central curvature radius of the object-side surface of the first lens L1;

R2: central curvature radius of the image-side surface of the first lens L1;

R3: central curvature radius of the object-side surface of the second lens L2;

R4: central curvature radius of the image-side surface of the second lens L2;

R5: central curvature radius of the object-side surface of the third lens L3;

R6: central curvature radius of the image-side surface of the third lens L3;

R7: central curvature radius of the object-side surface of the fourth lens L4;

R8: central curvature radius of the image-side surface of the fourth lens L4;

R9: central curvature radius of the object-side surface of the fifth lens L5;

R10: central curvature radius of the image-side surface of the fifth lens L5;

R11: central curvature radius of the object-side surface of the sixth lens L6;

R12: central curvature radius of the image-side surface of the sixth lens L6;

R13: central curvature radius of the object-side surface of the seventh lens L7;

R14: central curvature radius of the image-side surface of the seventh lens L7;

R15: central curvature radius of an object-side surface of the eighth lens L8;

R16: central curvature radius of an image-side surface of the eighth lens L8;

R17: central curvature radius of an object-side surface of the optical filter GF;

R18: central curvature radius of an image-side surface of the optical filter GF;

d: on-axis thickness of a lens and an on-axis distance between lenses;

d0: on-axis distance from the aperture S1 to the object-side surface of the first lens L1;

d1: on-axis thickness of the first lens L1;

d2: on-axis distance from the image-side surface of the first lens L1 to the object-side surface of the second lens L2;

d3: on-axis thickness of the second lens L2;

d4: on-axis distance from the image-side surface of the second lens L2 to the object-side surface of the third lens L3;

d5: on-axis thickness of the third lens L3;

d6: on-axis distance from the image-side surface of the third lens L3 to the object-side surface of the fourth lens L4;

d7: on-axis thickness of the fourth lens L4;

d8: on-axis distance from the image-side surface of the fourth lens L4 to the object-side surface of the fifth lens L5;

d9: on-axis thickness of the fifth lens L5;

d10: on-axis distance from the image-side surface of the fifth lens L5 to the object-side surface of the six lens L6;

d11: on-axis thickness of the sixth lens L6;

d12: on-axis distance from the image-side surface of the sixth lens L6 to the object-side surface of the seventh lens L7;

d13: on-axis thickness of the seventh lens L7;

d14: on-axis distance from the image-side surface of the seventh lens L7 to the object-side surface of the eighth lens L8;

d15: on-axis thickness of the eighth lens L8;

d16: on-axis distance from the image-side surface of the eighth lens L8 to the object-side surface of the optical filter GF;

d17: on-axis thickness of the optical filter GF;

d18: on-axis distance from the image-side surface of the optical filter GF to the image surface Si;

nd: refractive index of a d line;

nd1: refractive index of a d line of the first lens L1;

nd2: refractive index of a d line of the second lens L2;

nd3: refractive index of a d line of the third lens L3;

nd4: refractive index of a d line of the fourth lens L4;

nd5: refractive index of a d line of the fifth lens L5;

nd6: refractive index of a d line of the sixth lens L6;

nd7: refractive index of a d line of the seventh lens L7;

nd8: refractive index of a d line of the eighth lens L8;

ndg: refractive index of a d line of the optical filter GF;

νd: abbe number;

ν1: abbe number of the first lens L1;

ν2: abbe number of the second lens L2;

ν3: abbe number of the third lens L3;

ν4: abbe number of the fourth lens L4;

ν5: abbe number of the fifth lens L5;

ν6: abbe number of the sixth lens L6;

ν7: abbe number of the seventh lens L7;

ν8: abbe number of the eighth lens L8;

νg: abbe number of the optical filter GF.

Table 2 shows aspherical surface data of the camera optical lens 10 in Embodiment 1 of the present disclosure.

TABLE 2 Conic coefficient Aspheric surface coefficients k A4 A6 A8 A10 A12 R1 −4.4994E−01 −2.4586E−05 −2.6466E−04 2.9699E−04 −1.6537E−04 4.2414E−05 R2  1.9561E+01  8.7368E−03 −1.0088E−02 6.0083E−03 −1.9816E−03 4.0272E−04 R3 −1.0000E+03  2.6391E−02 −1.7700E−02 1.1720E−02 −4.2907E−03 9.7017E−04 R4  3.6721E+02  6.6906E−03  2.9103E−03 8.4843E−04 −7.3840E−04 2.2361E−04 R5 −4.9052E+00 −9.7358E−03  1.5471E−02 −7.9998E−03   2.6102E−03 −5.8396E−04  R6 −5.5985E+01  1.0766E−02 −1.0562E−02 4.3855E−03 −1.3254E−03 3.2552E−04 R7 −1.0000E+03  1.1959E−02 −1.1343E−02 9.1606E−03 −3.4260E−03 6.5221E−04 R8  2.4446E−01  5.1883E−03 −4.5544E−04 5.6596E−03 −2.2869E−03 3.5766E−04 R9  1.0864E+02 −6.7616E−03 −1.7313E−03 1.7666E−03 −1.0698E−03 6.3250E−04 R10  1.3064E+02 −5.2509E−03 −2.1686E−03 −7.4829E−04   5.7735E−04 −2.0964E−04  R11  2.2362E+01 −2.1761E−03 −1.6686E−03 −1.5105E−04  −1.5707E−03 1.0747E−03 R12 −5.4009E+00 −8.6251E−03  2.7953E−03 −1.2709E−03  −3.5146E−04 3.5435E−04 R13  9.0188E+00  1.9273E−03 −6.6195E−03 4.4415E−03 −2.7184E−03 9.7149E−04 R14 −5.9650E+01  9.6232E−03  3.5113E−03 −4.3038E−03   1.4954E−03 −2.6993E−04  R15  8.2784E+01 −1.2750E−02  4.9154E−03 −1.5983E−03   3.4953E−04 −4.7023E−05  R16 −2.7379E+01 −2.2118E−02  3.7711E−03 −7.7099E−04   1.1743E−04 −1.2310E−05  Conic coefficient Aspheric surface coefficients k A14 A16 A18 A20 R1 −4.4994E−01 −6.3642E−06 5.5123E−07 −1.9455E−08  1.4245E−10 R2  1.9561E+01 −5.1833E−05 3.9343E−06 −1.1935E−07 −1.5171E−09 R3 −1.0000E+03 −1.3085E−04 9.3377E−06 −3.2390E−07  9.1007E−09 R4  3.6721E+02 −3.0919E−05 2.0972E−06 −7.0322E−08 −2.3440E−08 R5 −4.9052E+00  8.6429E−05 −5.5953E−06   1.9477E−07 −4.0227E−08 R6 −5.5985E+01 −4.4615E−05 1.4046E−06  8.1553E−09  8.6375E−08 R7 −1.0000E+03 −3.8711E−05 −1.2582E−05   2.2861E−06 −1.4258E−08 R8  2.4446E−01  6.7100E−05 −4.2896E−05   4.8729E−06  2.0872E−07 R9  1.0864E+02 −2.0022E−04 3.4469E−05 −2.4137E−06 −2.6295E−08 R10  1.3064E+02  6.1125E−05 −1.0620E−05   6.1464E−07  4.0868E−08 R11  2.2362E+01 −3.2623E−04 4.7375E−05 −1.7739E−06 −8.4684E−08 R12 −5.4009E+00 −1.0031E−04 1.4677E−05 −1.3379E−06  8.5699E−08 R13  9.0188E+00 −1.8604E−04 1.7258E−05 −7.5152E−07  3.3489E−08 R14 −5.9650E+01  2.6163E−05 −1.2896E−06   3.3985E−08 −8.4701E−10 R15  8.2784E+01  3.6329E−06 −1.2915E−07   2.8500E−09 −1.8617E−10 R16 −2.7379E+01  7.5961E−07 −2.3566E−08   1.2589E−09 −6.8569E−11

In table 2, K is a conic coefficient, and A4, A6, A8, A10, A12, A14, A16, A18 and A20 are aspheric surface coefficients.

y=(x ² /R)/{1+[1−(k+1)(x ² /R ²)]^(1/2) }+A4x ⁴ +A6x ⁶ +A8x ⁸ +A10x ¹⁰ +A12x ¹² +A14x ¹⁴ +A16x ¹⁶ +A18x ¹⁸ +A20x ²⁰  (4)

Herein, x denotes a vertical distance between a point in an aspheric curve and the optical axis, and y denotes an aspheric depth (i.e. a vertical distance between the point having a distance of x from the optical axis and a plane tangent to a vertex on the optical axis of an aspheric surface).

For convenience, an aspheric surface of each lens surface uses the aspheric surfaces shown in the above condition (4). However, the present disclosure is not limited to the aspherical polynomials form shown in the condition (4).

Table 3 and Table 4 show design data of inflexion points and arrest points of each lens of the camera optical lens 10 in Embodiment 1 of the present disclosure. Herein, P1R1 and P1R2 represent the object-side surface and the image-side surface of the first lens L1, P2R1 and P2R2 represent the object-side surface and the image-side surface of the second lens L2, P3R1 and P3R2 represent the object-side surface and the image-side surface of the third lens L3, P4R1 and P4R2 represent the object-side surface and the image-side surface of the fourth lens L4, P5R1 and P5R2 represent the object-side surface and the image-side surface of the fifth lens L5, P6R1 and P6R2 represent the object-side surface and the image-side surface of the sixth lens L6, P7R1 and P7R2 represent the object-side surface and the image-side surface of the seventh lens L7, and P8R1 and P8R2 represent the object-side surface and the image-side surface of the eighth lens L8. The data in the column named “inflexion point position” refers to vertical distances from inflexion points arranged on each lens surface to the optic axis of the camera optical lens 10. The data in the column named “arrest point position” refers to vertical distances from arrest points arranged on each lens surface to the optical axis of the camera optical lens 10.

TABLE 3 Number(s) of Inflexion point Inflexion point inflexion points position 1 position 2 P1R1 0 / / P1R2 0 / / P2R1 1 0.255 / P2R2 1 2.025 / P3R1 0 / / P3R2 2 1.125 1.445 P4R1 2 1.665 1.835 P4R2 0 / / P5R1 2 0.705 1.205 P5R2 0 / / P6R1 0 / / P6R2 1 1.925 / P7R1 1 2.165 / P7R2 2 0.735 1.375 P8R1 1 2.245 / P8R2 2 0.705 2.745

TABLE 4 Number(s) of Arrest point arrest points position 1 P1R1 0 / P1R2 0 / P2R1 1 0.455 P2R2 0 / P3R1 0 / P3R2 0 / P4R1 0 / P4R2 0 / P5R1 0 / P5R2 0 / P6R1 0 / P6R2 0 / P7R1 0 / P7R2 0 / P8R1 1 2.745 P8R2 1 1.395

FIG. 2 and FIG. 3 show a longitudinal aberration and a lateral color of light with wavelengths of 656 nm, 587 nm, 546 nm, 486 nm and 436 nm after passing the camera optical lens 10 in Embodiment 1. FIG. 4 illustrates a schematic diagram of a field curvature and a distortion of light with a wavelength of 546 nm after passing the camera optical lens 10 in Embodiment 1. A field curvature S in FIG. 4 is a field curvature in a sagittal direction, and T is a field curvature in a tangential direction.

Table 13 in the following shows various values of Embodiments 1, 2 and 3 and values corresponding to the parameters specified in the above conditions.

As shown in Table 13, Embodiment 1 satisfies the various conditions.

In this Embodiment, an entrance pupil diameter (ENPD) of the camera optical lens 10 is 4.481 mm, an image height (IH) of 1.0H is 3.500 mm, and a field of view (FOV) in a diagonal direction is 42.10°. Thus, the camera optical lens 10 meets the design requirement for large aperture, long focal length and ultra-thinness. Its on-axis and off-axis chromatic aberrations are sufficiently corrected, thereby achieving excellent optical performance.

Embodiment 2

Embodiment 2 is basically the same as Embodiment 1, and the meaning of its symbols is the same as that of Embodiment 1. In the following, only differences are described.

FIG. 5 shows a schematic diagram of a structure of a camera optical lens 20 in Embodiment 2 of the present disclosure. In this embodiment, the first lens L1 has an image-side surface being convex in a paraxial region.

Table 5 and Table 6 show design data of the camera optical lens 20 in Embodiment 2 of the present disclosure.

TABLE 5 R d nd vd S1 ∞ d0= −0.746 R1 3.266 d1= 1.119 nd1 1.5444 v1 55.82 R2 −15.819 d2= 0.085 R3 −24.387 d3= 0.270 nd2 1.6400 v2 23.54 R4 61.878 d4= 0.070 R5 9.181 d5= 0.753 nd3 1.5444 v3 55.82 R6 11.302 d6= 0.089 R7 12.622 d7= 0.350 nd4 1.6610 v4 20.53 R8 4.001 d8= 0.691 R9 21.573 d9= 0.739 nd5 1.6400 v5 23.54 R10 −28.485 d10= 1.018 R11 −9.223 d11= 0.504 nd6 1.6610 v6 20.53 R12 −8.810 d12= 0.210 R13 −6.517 d13= 0.500 nd7 1.5444 v7 55.82 R14 −6.422 d14= 0.322 R15 −43.922 d15= 0.600 nd8 1.5444 v8 55.82 R16 5.574 d16= 0.767 R17 ∞ d17= 0.210 ndg 1.5168 vg 64.17 R18 ∞ d18= 0.832

Table 6 shows aspherical surface data of each lens of the camera optical lens 20 in Embodiment 2 of the present disclosure.

TABLE 6 Conic coefficient Aspheric surface coefficients k A4 A6 A8 A10 A12 R1 −5.5745E−01 −1.2666E−03 −1.3088E−05 2.2236E−04 −1.4103E−04 4.5397E−05 R2 −1.8427E+02  1.6378E−02 −9.0882E−03 5.9516E−03 −2.0075E−03 4.0508E−04 R3 −1.1453E+02  2.9806E−02 −1.7232E−02 1.1691E−02 −4.3094E−03 9.5982E−04 R4 −9.9902E+02  1.1745E−02  3.0248E−03 9.3076E−04 −7.6357E−04 2.1783E−04 R5  1.1643E+01  4.5974E−04  1.6307E−02 −7.9455E−03   2.6587E−03 −5.9364E−04  R6  3.1373E+01 −6.1471E−03 −6.2640E−03 4.7394E−03 −1.3541E−03 2.9941E−04 R7 −1.0752E+02  5.5070E−03 −1.0023E−02 1.0010E−02 −3.4503E−03 6.1554E−04 R8 −5.9059E+00  1.4367E−02  2.5958E−03 4.1630E−03 −1.8694E−03 5.0078E−04 R9  1.0397E+02 −6.7616E−03 −1.7313E−03 1.7666E−03 −1.0698E−03 6.3250E−04 R10  1.9633E+02 −5.2509E−03 −2.1686E−03 −7.4829E−04   5.7735E−04 −2.0964E−04  R11  2.1384E+01  2.8085E−04 −3.5631E−03 −2.1242E−04  −1.6037E−03 1.0023E−03 R12  8.2939E+00 −1.5906E−02  6.0318E−03 −1.8001E−03  −4.9857E−04 3.7048E−04 R13  7.1606E+00 −1.1735E−02 −4.1812E−04 4.5263E−03 −2.7539E−03 9.5601E−04 R14 −7.0832E+01  8.0561E−03  4.0506E−03 −4.2540E−03   1.4764E−03 −2.7219E−04  R15  1.4109E+02 −1.1311E−02  4.6382E−03 −1.7546E−03   3.4388E−04 −4.5644E−05  R16 −3.9162E+01 −2.2644E−02  4.0232E−03 −8.6815E−04   1.1822E−04 −1.1700E−05  Conic coefficient Aspheric surface coefficients k A14 A16 A18 A20 R1 −5.5745E−01 −6.6129E−06 4.5711E−07 −2.5375E−08 1.9253E−09 R2 −1.8427E+02 −5.1137E−05 3.8423E−06 −1.6698E−07 6.0712E−09 R3 −1.1453E+02 −1.3225E−04 9.5738E−06 −2.2054E−07 2.1419E−10 R4 −9.9902E+02 −3.2705E−05 1.4335E−06 −1.5662E−07 4.1950E−08 R5  1.1643E+01  8.2681E−05 −5.3704E−06   3.7222E−07 −9.4596E−08  R6  3.1373E+01 −5.0771E−05 3.6732E−07 −2.1077E−07 1.8232E−07 R7 −1.0752E+02 −4.9487E−05 −1.4637E−05   2.2352E−06 3.2665E−07 R8 −5.9059E+00  4.8706E−05 −6.3325E−05   2.1477E−06 2.4648E−06 R9  1.0397E+02 −2.0022E−04 3.4469E−05 −2.4137E−06 −2.6295E−08  R10  1.9633E+02  6.1125E−05 −1.0620E−05   6.1464E−07 4.0868E−08 R11  2.1384E+01 −3.3558E−04 5.2809E−05  9.9395E−07 −5.3375E−07  R12  8.2939E+00 −9.3911E−05 1.3648E−05 −1.8609E−06 2.4153E−07 R13  7.1606E+00 −1.9021E−04 1.6656E−05 −7.3596E−07 1.0817E−07 R14 −7.0832E+01  2.6351E−05 −1.2197E−06   3.8423E−08 −2.1169E−09  R15  1.4109E+02  3.8653E−06 −1.1455E−07   2.2248E−09 −5.1918E−10  R16 −3.9162E+01  7.5080E−07 −3.1597E−08   8.3507E−10 6.0250E−11

Table 7 and table 8 show design data of inflexion points and arrest points of each lens of the camera optical lens 20 in Embodiment 2 of the present disclosure.

TABLE 7 Number(s) of Inflexion point Inflexion point inflexion points position 1 position 2 P1R1 0 / / P1R2 1 0.585 / P2R1 1 0.365 / P2R2 1 1.895 / P3R1 1 1.975 / P3R2 0 / / P4R1 2 1.605 1.755 P4R2 0 / / P5R1 2 0.825 1.105 P5R2 0 / / P6R1 1 1.785 / P6R2 1 1.875 / P7R1 1 2.025 / P7R2 2 0.735 1.435 P8R1 1 2.345 / P8R2 2 0.655 2.765

TABLE 8 Number(s) of Arrest point arrest points position 1 P1R1 0 / P1R2 1 1.055 P2R1 1 0.665 P2R2 0 / P3R1 0 / P3R2 0 / P4R1 0 / P4R2 0 / P5R1 0 / P5R2 0 / P6R1 0 / P6R2 0 / P7R1 0 / P7R2 0 / P8R1 0 / P8R2 1 1.255

FIG. 6 and FIG. 7 show a longitudinal aberration and a lateral color of light with wavelengths of 656 nm, 587 nm, 546 nm, 486 nm and 436 nm after passing the camera optical lens 20 in Embodiment 2. FIG. 8 illustrates a schematic diagram of a field curvature and a distortion of light with a wavelength of 546 nm after passing the camera optical lens 20 in Embodiment 2. A field curvature S in FIG. 8 is a field curvature in a sagittal direction, and T is a field curvature in a tangential direction.

As shown in Table 13, Embodiment 2 satisfies the various conditions.

In this embodiment, an entrance pupil diameter (ENPD) of the camera optical lens 20 is 4.482 mm, an image height (IH) of 1.0H is 3.500 mm, and a field of view (FOV) in a diagonal direction is 42.10°. Thus, the camera optical lens 20 meets the design requirement for large aperture, long focal length and ultra-thinness. Its on-axis and off-axis chromatic aberrations are sufficiently corrected, thereby achieving excellent optical performance.

Embodiment 3

Embodiment 3 is basically the same as Embodiment 1, and the meaning of its symbols is the same as that of Embodiment 1. In the following, only differences are described.

FIG. 9 shows a schematic diagram of a structure of a camera optical lens 30 in Embodiment 3 of the present disclosure. In this embodiment, the sixth lens L6 has a negative refractive power, the seventh lens L7 has a negative refractive power, and the first lens L1 has an image-side surface being convex in the paraxial region.

Table 9 and Table 10 show design data of the camera optical lens 30 in Embodiment 3 of the present disclosure

TABLE 9 R d nd vd S1 ∞ d0= −0.775 R1 3.290 d1= 1.119 nd1 1.5444 v1 55.82 R2 −13.747 d2= 0.085 R3 −12.163 d3= 0.270 nd2 1.6400 v2 23.54 R4 269.511 d4= 0.070 R5 10.251 d5= 0.791 nd3 1.5444 v3 55.82 R6 11.331 d6= 0.070 R7 10.914 d7= 0.354 nd4 1.6610 v4 20.53 R8 4.712 d8= 0.628 R9 24.485 d9= 0.739 nd5 1.6400 v5 23.54 R10 −16.535 d10= 0.868 R11 −9.716 d11= 0.483 nd6 1.6610 v6 20.53 R12 −11.516 d12= 0.364 R13 −6.349 d13= 0.500 nd7 1.5444 v7 55.82 R14 −8.412 d14= 0.390 R15 −18.729 d15= 0.601 nd8 1.5444 v8 55.82 R16 7.673 d16= 0.762 R17 ∞ d17= 0.210 ndg 1.5168 vg 64.17 R18 ∞ d18= 0.822

Table 10 shows aspherical surface data of each lens of the camera optical lens 30 in Embodiment 3 of the present disclosure.

TABLE 10 Conic coefficient Aspheric surface coefficients k A4 A6 A8 A10 A12 R1 −5.1496E−01 −1.2605E−03  7.8666E−05 2.2327E−04 −1.4175E−04 4.4676E−05 R2 −1.4151E+02  1.6309E−02 −8.7064E−03 5.9663E−03 −2.0158E−03 4.0295E−04 R3 −2.2376E+01  2.9448E−02 −1.7397E−02 1.1625E−02 −4.3172E−03 9.6024E−04 R4 −9.8907E+02  1.2177E−02  2.7178E−03 8.0594E−04 −7.8712E−04 2.1722E−04 R5  1.5917E+01  4.8186E−03  1.5506E−02 −7.9192E−03   2.6612E−03 −5.9701E−04  R6  3.0365E+01 −4.9936E−03 −5.8750E−03 4.5151E−03 −1.3896E−03 3.0062E−04 R7 −1.2024E+02  3.2354E−03 −9.6239E−03 1.0071E−02 −3.4805E−03 6.1634E−04 R8 −1.5055E+01  1.3180E−02  9.1340E−04 4.4956E−03 −1.8222E−03 4.6052E−04 R9  1.0485E+02 −6.7616E−03 −1.7313E−03 1.7666E−03 −1.0698E−03 6.3250E−04 R10  6.4977E+01 −5.2509E−03 −2.1686E−03 −7.4829E−04   5.7735E−04 −2.0964E−04  R11  1.9484E+01 −8.0677E−03 −2.1041E−03 −9.8665E−05  −1.6424E−03 1.0024E−03 R12  1.7413E+00 −1.5645E−02  5.5194E−03 −1.4997E−03  −5.2718E−04 3.6224E−04 R13  4.8032E+00 −8.3629E−03 −1.5942E−03 3.7459E−03 −2.7092E−03 9.8284E−04 R14 −1.1821E+02  3.3150E−03  3.9836E−03 −4.2404E−03   1.4687E−03 −2.7230E−04  R15  3.5030E+01 −1.4549E−02  4.6792E−03 −1.7768E−03   3.4785E−04 −4.4505E−05  R16 −6.7014E+01 −2.3401E−02  3.7029E−03 −8.4010E−04   1.1939E−04 −1.1757E−05  Conic coefficient Aspheric surface coefficients k A14 A16 A18 A20 R1 −5.1496E−01 −6.7198E−06 4.6917E−07 −2.0521E−08 9.3014E−10 R2 −1.4151E+02 −5.1480E−05 3.8111E−06 −1.6181E−07 8.7851E−09 R3 −2.2376E+01 −1.3188E−04 9.6346E−06 −2.2104E−07 2.2672E−10 R4 −9.8907E+02 −3.1535E−05 1.8624E−06 −9.2079E−08 2.1393E−08 R5  1.5917E+01  8.1513E−05 −5.5398E−06   4.0763E−07 −7.0149E−08  R6  3.0365E+01 −4.8118E−05 1.2795E−06 −1.5685E−07 1.2320E−07 R7 −1.2024E+02 −4.6506E−05 −1.3542E−05   2.3834E−06 1.5452E−07 R8 −1.5055E+01  4.5352E−05 −5.5204E−05   4.8314E−06 9.7670E−07 R9  1.0485E+02 −2.0022E−04 3.4469E−05 −2.4137E−06 −2.6295E−08  R10  6.4977E+01  6.1125E−05 −1.0620E−05   6.1464E−07 4.0868E−08 R11  1.9484E+01 −3.3171E−04 5.5139E−05  1.2632E−06 −9.0161E−07  R12  1.7413E+00 −9.2641E−05 1.4448E−05 −1.7444E−06 2.2237E−07 R13  4.8032E+00 −1.9063E−04 1.5190E−05 −8.9528E−07 2.0992E−07 R14 −1.1821E+02  2.6543E−05 −1.1930E−06   3.7244E−08 −2.8012E−09  R15  3.5030E+01  3.9461E−06 −1.1951E−07   6.3244E−10 −5.2791E−10  R16 −6.7014E+01  7.5938E−07 −3.0535E−08   9.2714E−10 6.0844E−11

Table 11 and Table 12 show design data of inflexion points and arrest points of each lens of the camera optical lens 30 in Embodiment 3 of the present disclosure.

TABLE 11 Number(s) of Inflexion point Inflexion point inflexion points position 1 position 2 P1R1 0 / / P1R2 1 0.615 / P2R1 1 0.565 / P2R2 0 / / P3R1 0 / / P3R2 0 / / P4R1 2 1.635 1.805 P4R2 0 / / P5R1 2 0.725 1.195 P5R2 0 / / P6R1 1 1.795 / P6R2 1 1.765 / P7R1 1 1.945 / P7R2 0 / / P8R1 1 2.265 / P8R2 2 0.575 2.665

TABLE 12 Number(s) of Arrest point arrest points position 1 P1R1 0 / P1R2 1 1.085 P2R1 1 1.025 P2R2 0 / P3R1 0 / P3R2 0 / P4R1 0 / P4R2 0 / P5R1 0 / P5R2 0 / P6R1 0 / P6R2 1 1.965 P7R1 0 / P7R2 0 / P8R1 0 / P8R2 1 1.065

FIG. 10 and FIG. 11 show a longitudinal aberration and a lateral color of light with wavelengths of 656 nm, 587 nm, 546 nm, 486 nm and 436 nm after passing the camera optical lens 30 in Embodiment 3. FIG. 12 illustrates a schematic diagram of a field curvature and a distortion of light with a wavelength of 546 nm after passing the camera optical lens 30 in Embodiment 3. A field curvature S in FIG. 12 is a field curvature in a sagittal direction, and T is a field curvature in a tangential direction.

Table 13 in the following shows values corresponding to various conditions according to the aforementioned conditions in this embodiment. Apparently, the camera optical lens 30 in this embodiment satisfies the aforementioned conditions.

In this embodiment, an entrance pupil diameter (ENPD) of the camera optical lens 30 is 4.481 mm, an image height (IH) of 1.0H is 3.500 mm, and a field of view (FOV) in a diagonal direction is 42.25°. Thus, the camera optical lens 30 meets design requirements for large aperture, long focal length and ultra-thinness. Its on-axis and off-axis chromatic aberrations are sufficiently corrected, thereby achieving excellent optical performance.

TABLE 13 Parameters and conditions Embodiment 1 Embodiment 2 Embodiment 3 f/TTL 0.96 0.98 0.98 f2/f −3.99 −3.01 −2.01 (R5 + R6)/(R5 − R6) −3.01 −9.66 −19.98 f 8.963 8.965 8.963 f1 6.719 5.056 4.971 f2 −35.805 −27.029 −17.998 f3 14.841 79.483 156.313 f4 −8.064 −8.907 −12.693 f5 19.139 19.103 15.378 f6 127.485 197.772 −104.149 f7 25.101 281.743 −51.775 f8 −6.894 −9.009 −9.877 f12 7.997 6.016 6.523 FNO 2.00 2.00 2.00 TTL 9.355 9.129 9.126 IH 3.500 3.500 3.500 FOV 42.10° 42.10° 42.25°

It will be understood by those of ordinary skills in the art that the embodiments described above are specific embodiments realizing the present disclosure. In practice, various changes may be made to these embodiments in form and in detail without departing from the spirit and scope of the disclosure. 

What is claimed is:
 1. A camera optical lens comprising, from an object side to an image side in sequence: a first lens having a positive refractive power, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens; wherein the camera optical lens satisfies following conditions: 0.95≤f/TTL; −4.00≤f2/f≤−2.00; and −20.00≤(R5+R6)/(R5−R6)≤−3.00; where TTL denotes a total optical length from an object-side surface of the first lens to an image surface of the camera optical lens along an optical axis; f denotes a focal length of the camera optical lens; f2 denotes a focal length of the second lens; R5 denotes a central curvature radius of an object-side surface of the third lens; and R6 denotes a central curvature radius of an image-side surface of the third lens.
 2. The camera optical lens according to claim 1, wherein the camera optical lens further satisfies the following condition: −1.50≤f4/f≤−0.85; where f4 denotes a focal length of the fourth lens.
 3. The camera optical lens according to claim 1, wherein the camera optical lens further satisfies following conditions: 0.28≤f1/f≤1.12; −2.62≤(R1+R2)/(R1−R2)≤−0.41; and 0.06≤d1/TTL≤0.18; where f1 denotes a focal length of the first lens; R1 denotes a central curvature radius of the object-side surface of the first lens; R2 denotes a central curvature radius of an image-side surface of the first lens; and d1 denotes an on-axis thickness of the first lens.
 4. The camera optical lens according to claim 1, wherein the camera optical lens further satisfies following conditions: −1.83≤(R3+R4)/(R3−R4)≤0.21; and 0.01≤d3/TTL≤0.04; where R3 denotes a central curvature radius of an object-side surface of the second lens; R4 denotes a central curvature radius of an image-side surface of the second lens; and d3 denotes an on-axis thickness of the second lens.
 5. The camera optical lens according to claim 1, wherein the camera optical lens further satisfies following conditions: 0.83≤f3/f≤26.16; and 0.04≤d5/TTL≤0.13; where f3 denotes a focal length of the third lens; and d5 denotes an on-axis thickness of the third lens.
 6. The camera optical lens according to claim 1, wherein the camera optical lens further satisfies following conditions: 0.68≤(R7+R8)/(R7−R8)≤3.78; and 0.02≤d7/TTL≤0.06; where R7 denotes a central curvature radius of an object-side surface of the fourth lens; R8 denotes a central curvature radius of an image-side surface of the fourth lens; and d7 denotes an on-axis thickness of the fourth lens.
 7. The camera optical lens according to claim 1, wherein the camera optical lens further satisfies following conditions: 0.86≤f5/f≤3.20; −0.28≤(R9+R10)/(R9−R10)≤0.29; and 0.04≤d9/TTL≤0.12; where f5 denotes a focal length of the fifth lens; R9 denotes a central curvature radius of an object-side surface of the fifth lens; R10 denotes a central curvature radius of an image-side surface of the fifth lens; and d9 denotes an on-axis thickness of the fifth lens.
 8. The camera optical lens according to claim 1, wherein the camera optical lens further satisfies following conditions: −23.24≤f6/f≤33.09; −23.59≤(R11+R12)/(R11−R12)≤65.50; and 0.03≤d11/TTL≤0.11; where f6 denotes a focal length of the sixth lens; R11 denotes a central curvature radius of an object-side surface of the sixth lens; R12 denotes a central curvature radius of an image-side surface of the sixth lens; and d11 denotes an on-axis thickness of the sixth lens.
 9. The camera optical lens according to claim 1, wherein the camera optical lens further satisfies following conditions: −11.55≤f7/f≤47.14; −14.31≤(R13+R14)/(R13−R14)≤204.30; and 0.03≤d13/TTL≤0.08; where f7 denotes a focal length of the seventh lens; R13 denotes a central curvature radius of an object-side surface of the seventh lens; R14 denotes a central curvature radius of an image-side surface of the seventh lens; and d13 denotes an on-axis thickness of the seventh lens.
 10. The camera optical lens according to claim 1, wherein the camera optical lens further satisfies following conditions: −2.20≤f8/f≤−0.51; 0.21≤(R15+R16)/(R15−R16)≤1.16; and 0.03≤d15/TTL≤0.10; where f8 denotes a focal length of the eighth lens; R15 denotes a central curvature radius of an object-side surface of the eighth lens; R16 denotes a central curvature radius of an image-side surface of the eighth lens; and d15 denotes an on-axis thickness of the eighth lens. 